// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA

using System;
using System.Data;
using MySql.Data.MySqlClient;
using System.Globalization;

namespace MySql.Data.Types
{
	internal struct MySqlInt32 : IMySqlValue
	{
		private int mValue;
		private bool isNull;
		private bool is24Bit;

		private MySqlInt32(MySqlDbType type)
		{
			is24Bit = type == MySqlDbType.Int24 ? true : false;
			isNull = true;
			mValue = 0;
		}

		public MySqlInt32(MySqlDbType type, bool isNull)
			: this(type)
		{
			this.isNull = isNull;
		}

		public MySqlInt32(MySqlDbType type, int val)
			: this(type)
		{
			this.isNull = false;
			mValue = val;
		}

		#region IMySqlValue Members

		public bool IsNull
		{
			get { return isNull; }
		}

		MySqlDbType IMySqlValue.MySqlDbType
		{
			get { return MySqlDbType.Int32; }
		}

		DbType IMySqlValue.DbType
		{
			get { return DbType.Int32; }
		}

		object IMySqlValue.Value
		{
			get { return mValue; }
		}

		public int Value
		{
			get { return mValue; }
		}

		Type IMySqlValue.SystemType
		{
			get { return typeof(Int32); }
		}

		string IMySqlValue.MySqlTypeName
		{
			get { return is24Bit ? "MEDIUMINT" : "INT"; }
		}

		void IMySqlValue.WriteValue(MySqlPacket packet, bool binary, object val, int length)
		{
			int v = (val is Int32) ? (int)val : Convert.ToInt32(val);
			if (binary)
                packet.WriteInteger((long)v, is24Bit ? 3 : 4);
			else
                packet.WriteStringNoNull(v.ToString());
		}

        IMySqlValue IMySqlValue.ReadValue(MySqlPacket packet, long length, bool nullVal)
		{
			if (nullVal)
				return new MySqlInt32((this as IMySqlValue).MySqlDbType, true);

			if (length == -1)
				return new MySqlInt32((this as IMySqlValue).MySqlDbType,
                     packet.ReadInteger(4));
			else
				return new MySqlInt32((this as IMySqlValue).MySqlDbType,
                     Int32.Parse(packet.ReadString(length),
					 CultureInfo.InvariantCulture));
		}

        void IMySqlValue.SkipValue(MySqlPacket packet)
        {
            packet.Position += 4;
        }

		#endregion

		internal static void SetDSInfo(DataTable dsTable)
		{
			string[] types = new string[] { "INT", "YEAR", "MEDIUMINT" };
			MySqlDbType[] dbtype = new MySqlDbType[] { MySqlDbType.Int32, 
                MySqlDbType.Year, MySqlDbType.Int24 };

			// we use name indexing because this method will only be called
			// when GetSchema is called for the DataSourceInformation 
			// collection and then it wil be cached.
			for (int x = 0; x < types.Length; x++)
			{
				DataRow row = dsTable.NewRow();
				row["TypeName"] = types[x];
				row["ProviderDbType"] = dbtype[x];
				row["ColumnSize"] = 0;
				row["CreateFormat"] = types[x];
				row["CreateParameters"] = null;
				row["DataType"] = "System.Int32";
				row["IsAutoincrementable"] = dbtype[x] == MySqlDbType.Year ? false : true;
				row["IsBestMatch"] = true;
				row["IsCaseSensitive"] = false;
				row["IsFixedLength"] = true;
				row["IsFixedPrecisionScale"] = true;
				row["IsLong"] = false;
				row["IsNullable"] = true;
				row["IsSearchable"] = true;
				row["IsSearchableWithLike"] = false;
				row["IsUnsigned"] = false;
				row["MaximumScale"] = 0;
				row["MinimumScale"] = 0;
				row["IsConcurrencyType"] = DBNull.Value;
				row["IsLiteralSupported"] = false;
				row["LiteralPrefix"] = null;
				row["LiteralSuffix"] = null;
				row["NativeDataType"] = null;
				dsTable.Rows.Add(row);
			}
		}
	}
}
